[PATCH] SERIAL: allow shared 8250_pnp interrupts

PNP devices can use shared interrupts, so check to see whether we'll need
SA_SHIRQ for request_irq().

The builtin PDH UART on the HP rx8640 is an example of an ACPI/PNP device
that uses a shareable level-triggered, active-low interrupt.  The interrupt
can be shared in very large I/O configurations or by artificially lowering
IA64_DEF_LAST_DEVICE_VECTOR.

Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: Adam Belay <[email protected]>
Cc: Matthieu Castet <[email protected]>
Cc: Li Shaohua <[email protected]>
Cc: Len Brown <[email protected]>
Acked-by: Russell King <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/drivers/serial/8250_pnp.c b/drivers/serial/8250_pnp.c
index 739bc84f91e9217ebce019ed8383ad8ed75a74a0..632f62d6ec7e773d09ac9c3a2fb9b5b693bb197b 100644 (file)
--- a/drivers/serial/8250_pnp.c
+++ b/drivers/serial/8250_pnp.c
@@ -431,6 +431,8 @@ serial_pnp_probe(struct pnp_dev *dev, const struct pnp_device_id *dev_id)
 #endif
 
        port.flags |= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF;
+       if (pnp_irq_flags(dev, 0) & IORESOURCE_IRQ_SHAREABLE)
+               port.flags |= UPF_SHARE_IRQ;
        port.uartclk = 1843200;
        port.dev = &dev->dev;